Update README.md

[RichMorin]

Tidy up the grammar, etc.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 73.19%. Comparing base (3a659fd) to head (9e2c5ec).
Report is 6 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #759       +/-   ##
===========================================
+ Coverage   17.32%   73.19%   +55.87%     
===========================================
  Files          24       64       +40     
  Lines         710     1940     +1230     
===========================================
+ Hits          123     1420     +1297     
+ Misses        587      520       -67     

Flag	Coverage Δ
api	69.90% <ø> (+52.57%)	⬆️
elixir	17.32% <ø> (ø)
erlang	74.51% <ø> (?)
exporter	73.06% <ø> (?)
sdk	77.30% <ø> (?)
zipkin	54.16% <ø> (?)

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